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fatented Apr. 13, 1886.

E. s. MGGLELLAN.)

AIR INLET AND SEAL FOR WASTE PPE AND TRAPS.

(No Model.)

Ihre

Arana rares.

EZRA S. MCCLELDAN, OF PATTERSON, NEV JERSEY.

AIR-INLET AND SEAL FOR WASTEH-PIPES AND TRAPS.

i SPECIFICATION forming part of Letters Patent No. 339,800fiated April 13,1886.

Application filed January 2, 1886. Serial No. 187,348. (No modelff' if *e To @ZZ whom, it may concern,.-

Be it known that I, EZRA S. MCCLELLAN, of Paterson, in the countyof Passaic and State of New Jersey, have invented an Improvement in Air-Inlets and Seals for faste-Pipes and Traps, of which the following is a specification.

My improvement is for admitting air to the traps of basins, water-closets, &c. when the descending column of water tends to siphon out the trap, and thereby prevent theY air drawing through or forcing out the contents ofthe trap, and this air-valve effectually closes the air-inlet against any back-pressure in the sewer-pipe.

In the drawings, Figure l is a vertical section showing my improvement as applied to a basin-trap. Fig. 2 is a sectional plan at the line x, and Fig. 3 is a sectional elevation of my improvements as applied to an ordinary trap for a basin or closet.

The ease A is made with a cylindrical terior, c, and a bottom, b, and a rising ai rin let pipe, c, passing up through the bottom, and there is a bell-shaped cylinder, B, from the top of which a pipe, C, passes to the sewer or discharge side of the trap H. The cylinder B is placed within the cylinder a, and its lower end is immersed in mercury contained in the vessel A, and within the bell-shaped cylinder- Bis an air-valve, F, formed as an inverted cylindrical cup, the lower' edge of which passes into the mercury and rests upon the bottom b. The air-inlet tube c rises up within this cupshaped valve F,so as to be at the proper height above thesurface of the mercury. lt will now be understood that the water or other material flowing off to the sewer by the pipe D sometimes produces apartial vacuum, and if air is not admitted into such'pipe D the contents of the trap H will be displaced, or partially so, and a noise produced by drawing air into the sewer pipe, and sometimes, with lordinary traps, the water will be drawn out by a siphoning action. My present improvement prevents this difficulty, because as soon as there is a minus pressure or partial vacuum the pressure of the air acting beneath the cup-valve F lifts the same, and the air drawsin beneath its lower edge, and passes into the pipev C and waste-pipe D, to equalize the pressure and prevent the formation of a partial vacuum; but as soon as the equilibrium in the pressure is restored the inverted-cup valve F drops toits normal position in the mercury seal, and no gases can escape, because the column of mercury forced up between the cup F andthe cylindrical bell D resists the pressure ot' the sewer-gases.

My improvement may be used with any desired eharaeterof waste-pipe or sewertrap 6o such, for instance, as that shown in Fig. 3. I have, however, shown the same in Fig. l as connected with a basin and mercury seal. The basin K has a tubular dsehargepipe, L, passing down within the trap H, and there is a but the upper end ofthe pipe R is sufficiently above the bottom of the vessel Ato insure the retention in said vessel A of the proper depth ofmercury to maintain the seal for the valve F when the sealof the trap is open.

Vhen the dis )lacer l) is raised the mercur 8o l i .l

will run out ofthe trap H into the vessel N, and allow the contents lof the basin K to escape through the trap H and waste-pipe D, and when the displacel- P is dropped the valve at the lower end of the displacer-stem almost 85 closes the opening leading` to the pipe M, and the mercury is gradually forced out Vfrom the vessel P and rises in the trap lil'. The ad vantage of connecting the mercury inthetrap with the mercury of the ail-valve before de- 9o scribed is, that when the displacer P is depressed the level of the mercury will be raised both in the trap H, vessel A, and pipe R, and the reverse; hence the seal ofthe-valve is always equal in height to the seal of the trap when closed, and a sufficient seal is preserved in the valvecase when the seal of the trap is open, and the supply of mercury is automatic in the valve-case.

The air-valve will rise freely to admit air loo into the sewer-pipe when there is a minus pressure in the sewer-pipe, because the valve willlift without the level of the column of mercury inside and outside, the cylinder of the The position of 7o valve being materially changed by the action of the air,which lifts the valve out of the mercury.

I clairn as niy inventionl. The combination, with the vessel A and inlet air-pipe c, of the bell-shaped cylinder B and pipe C, leading to the waste-pipe D, and the inverted-cup-shaped valve F within/'the cylinder B, and the mercury seal, into "which the lower end of the valve F passes, snbstantially as set forth.

2. The combination, with the vessel'A, airinlet pipe c, and' cylinder` of the pipe C, leading to thewaste-pipe D, and theinvertedcup-shaped valve F', the trap H, the pipe M, leading froni the bottom of the trap, the mercury-vessel N, the displaccr P, and the pipe R, leading from the vessel A to the pipe M,

whereby" the mercury sealfin the vessel A is' raised and lowered simultaneously with the mercgry seal in the trap H, substantially as n ff'; A veSsel containing mercury, an invert- Yed-cup-shaped air-valve, with the lower part thereof` init-he mercury, an air-inlet within the cup-shaped valve, a case, and a pipe toconuect With'a sewer. or drain pipe, substantially ask GEO. T. PINCKNEY, WILLIAM G. MoTT. 

